Alicia Keys: Being Married Is 'So Fly'

"It's so fly," the singer tells PEOPLE. "There's something great about feeling at peace and ease with your partner and knowing you understand each other. I really enjoy that friendship."

Keys, 31, who will celebrate her one-year anniversary with producer husband Swizz Beatz on July 31, adds that being like-minded with her mate helps keep things harmonious.

"There are so many similarities between us, it's just mind-blowing," she says of Beatz, 32 (with whom she welcomed a son named Egypt last fall). "It's really cool to have met my equal."

In fact, the two are so in sync that Keys even trusts Beatz (real name: Kaseem Dean) with helping her pick outfits for public appearances.

"I can say, 'I'm not sure about this look for the BET Awards. What do you think?' and I know that he will honestly tell me exactly what's up," she says.

The singer, who is also celebrating a professional anniversary – with the re-release her 2001 debut album, Songs in A Minor – says her wedding day tops the list of her favorite moments over a very eventful decade.

"When I walked down [the aisle] and saw him, I could barely hold myself together," she says. "It was so beautiful – just about he and I and our love. The wedding was one of the best days of my life."